US debt is still low vs the eurozone. You’re not in bankruptcy, yet, although the scope of the deficit is bad news.
You’ll see an Obama assassination before you’ll see debt + default of the USA.
That some might be worse off doesn’t change things. And it’s not just a matter of current debt. You have to look where things will be in the future.
There is no plan by either party that will bring the deficit, let alone the total debt, into control in the forseeable future. The political will to enact such a plan does not exist in this country.
Beyond that, there are trillions of unfunded liabilities down the road. Social Security, Medicare, government pensions. It’s massive and there’s no way to pay for it. As it stands right now, looking ahead, default or devaluation throught the printing press are the only options.